I've been asking this question myself, ever since the news broke.
Peter Strzok’s testimony about the email server scandal involving former Secretary of State Hillary Clinton ... revealed a potential bombshell.
. . .
According to [Representative] Gohmert, the [Intelligence Community Inspector General] discovered that, with four exceptions, “every single one” of Clinton’s emails—more than 30,000—“were going to an address that was not on the distribution list.”
In other words, according to the information Gohmert received from the intelligence inspector general, something was causing Clinton’s server to send copies of all of her email communications outside of the country “to an unauthorized source that was a foreign entity unrelated to Russia.”
If true, this means that Clinton’s email communication with her top aides, department leadership, ambassadors, and other officials, including President Barack Obama, may have been read by an alien entity, perhaps a foreign power hostile to the United States. That could include confidential, sensitive, and even classified information about our foreign policy or our allies.
. . .
One of the other disturbing bits of information that came out of this exchange was that, according to Gohmert, the Office of the Intelligence Community Inspector General called Michael Horowitz, the inspector general of the Department of Justice, “four times” because it wanted to brief Horowitz about this forensic analysis and this security breach. But, according to Gohmert, Horowitz “never returned the call.”
According to Horowitz’s recent report on the Clinton email server investigation, the FBI “did not find evidence confirming that Clinton’s email server systems were compromised by cyber means,” but they could not definitively determine that her servers had not been compromised.
Obviously, if the intelligence inspector general has information to the contrary, that would be significant.
If this is true, the Justice Department, the FBI, and the intelligence inspector general have an obligation to disclose to the public and to lawmakers the foreign entity that hacked into Clinton’s server and received all of those communications.
There's more at the link.
I get the feeling that the same anti-Trump, pro-Clinton cabal that has been partially exposed in the top echelons of our federal law enforcement and intelligence agencies is deliberately stalling on this. I believe they're waiting for the November mid-term elections, in the desperate hope that a Democratic Party majority will take over the House of Representatives and shut down the investigation into their actions. I can think of no other reason for their foot-dragging, constant evasions, and lack of openness towards those charged with overseeing their operations. Can you, dear reader, think of any other explanation? If so, I'd love to hear it.
I hope President Trump will declassify and release all relevant documents in full, so that Congress - and the American people - can judge for themselves. If the suspicions outlined above are true - suspicions I share - then Hillary Clinton, along with every official who tried to cover up for her, should be arraigned on national security charges. Nothing less will suffice.